TWI416221B - A backlight module with localized light source control - Google Patents

Abstract

A backlight module with localized light source control is provided. The backlight module includes a first light guide plate, a second light guide plate, and a plurality of luminous elements. The first light guide plate includes a first side. The second light guide plate includes a second side. The first and second light guide plates are disposed along a first direction, so that the first side of the first light guide and the second side of the second light guide face to each other. The luminous elements are respectively disposed along the first side and the second side and emit lights thereto, wherein at least a portion of the luminous elements disposed along the first side and the second side form a light source module so as to act simultaneously.

Description

Backlight module with local light source control function

The present invention relates to a backlight module; in particular, the present invention relates to a backlight module having a local light source control function.

The liquid crystal molecules in the liquid crystal display do not emit light by themselves, and therefore an external light source is required to achieve the display function of the liquid crystal display. The general practice is to use a backlight module disposed behind the liquid crystal display panel as a light source of the liquid crystal display. The backlight module is mainly composed of a light-emitting element and a light guide plate, and light generated by the light-emitting element is transmitted through the light guide plate and uniformly emitted to the liquid crystal display panel, thereby achieving a display function.

Today, LCD TVs and other related products are becoming more and more popular. How to break through the limitations of process technology and cost to produce larger-sized products has always been an important factor affecting product competitiveness. Under such a demand, a method of splicing a plurality of small-sized light guide plates into a large-sized light guide plate group has been proposed. This approach makes the fabrication of larger-sized backlight modules easier to meet the increasingly demanding requirements for LCD displays. In addition, the light guide plate group formed by the splicing method can enable the light-emitting elements to illuminate the individual light guide plates in the light guide plate group as needed, thereby realizing the local dimming function of the backlight module.

FIG. 1A is a schematic diagram of a conventional backlight module. As shown in FIG. 1A, a plurality of light sources 2 are disposed on opposite sides of the light guide plate 1, and each of the light guide plates 1 is correspondingly divided into three light-emitting blocks (for example, light-emitting blocks A to C), and each light-emitting block corresponds to In a light source group (for example, light source groups a to c), each light source group is composed of a plurality of light sources 2 located on both sides of the corresponding light-emitting block. The three light guide plates 1 share a total of nine to nine light-emitting blocks, corresponding to nine light source groups a to i, respectively. Each light source group can be driven separately to achieve a local brightening function.

However, such a light source group division manner in units of the light guide plate 1 is limited by the layout of the light guide plate 1. When the local light-extinguishing function is used, it is easy to form a clear light-dark boundary at the joint between the two light guide plates 1, so that The distribution of light on the light guide plate 1 is uneven. For example, when only the light-emitting block E is lit, a clear light-dark boundary X is formed between the light-emitting block E and the light-emitting block B, as shown in FIG. 1B. Such a situation may cause uneven light output of the backlight module, which may adversely affect the display effect of the entire liquid crystal display.

It is an object of the present invention to provide a backlight module that reduces the light-dark boundary caused by the joints of different light guide plates and makes the distribution of light on the light guide plate more uniform, thereby improving the problems in the prior art described above.

The backlight module of the present invention comprises a first light guide plate, a second light guide plate and a light-emitting element. The first light guide plate includes a first light incident side. The second light guide plate includes a second light incident side, and the first light guide plate and the second light guide plate are disposed in a first direction, so that the first light incident side of the first light guide plate and the second light incident side of the second light guide plate are opposite to each other. face. The plurality of light-emitting elements are respectively disposed along the first light-incident side and the second light-incident side, and respectively emit light toward the light-input side, wherein at least one of the light-emitting elements disposed along the first light-incident side and the second light-incident side A part of the light-emitting module is configured to be simultaneously activated and extinguished, thereby forming a light-emitting block between the first light guide plate and the second light guide plate. The structure of forming the light-emitting block between the different light guide plates causes the light generated by the light-emitting module to be distributed in a gradual manner in the light-emitting block to improve the formation of the joints of the different light guide plates when the local light-extinguishing function is realized. Light and dark borders.

The invention provides a backlight module. In a preferred embodiment, the backlight module is for use with a flat display device. However, in various embodiments, the backlight module can also be used by other devices that require a backlight source.

2 is a schematic view of a first embodiment of a backlight module of the present invention. As shown in FIG. 2 , the backlight module includes a light guide plate set 10 , a light emitting element 20 , and a substrate 30 . The light guide plate group 10 includes a first light guide plate 11 , a second light guide plate 12 , and a third light guide plate 13 . The first light guide plate 11 includes a first light incident side 112; the second light guide plate 12 includes a second light incident side 121 and a third light incident side 122; and the third light guide plate 13 includes a fourth light incident side 131. The first light guide plate 11 , the second light guide plate 12 , and the third light guide plate 13 are arranged side by side in the first direction D ₁ such that the first light incident side 112 and the second light incident side 121 face each other, and the third light incident side 122 Then it faces the fourth light incident side 131.

In a preferred embodiment, the light-emitting element 20 is a side-emitting light-emitting diode. As shown in FIG. 2, the plurality of light-emitting elements 20 are disposed opposite to each other along the side edges 111 to 132 of the first light guide plate 11, the second light guide plate 12, and the third light guide plate 13, so as to be disposed on the first light-incident side 112 and The light-emitting elements 20 on the second light-incident side 121 can respectively emit light toward the first light-incident side 112 and the second light-incident side 121; the light-emitting elements 20 disposed on the third light-incident side 122 and the fourth light-incident side 131 can respectively face The third light-incident side 122 and the fourth light-incident side 131 emit light, and the light-emitting elements 20 disposed on the other side edges 111 and 132 of the first light guide plate 11 and the third light guide plate 13 can respectively face the opposite sides 111 thereof. 132 inside the light.

In this embodiment, the light-emitting blocks B _A , B _B and B _C respectively cover a portion of the first light guide plate 11 and the second light guide plate 12 such that the light-emitting blocks B _A , B _B and B _C straddle The two light guide plates, the light-emitting blocks B _D , B _E and B _F respectively cover a portion of the second light guide plate 12 and the third light guide plate 13 such that the light-emitting blocks B _D , B _E and B _F straddle Two light guide plates. The light-emitting elements 20 disposed along the first light-incident side 112 and the second light-incident side 121 are divided into three light-emitting modules M _A , M _B and M _C corresponding to the light-emitting blocks B _A , B _B and B _{C , respectively.} The light-emitting elements 20 disposed along the third light-incident side 122 and the fourth light-incident side 131 are also divided into three light-emitting modules M _D , M _E and M _F , which respectively correspond to the light-emitting blocks B _D , B _E and B _F. The length of the light-emitting block is defined by the length of the light-emitting module and is related to the length of the corresponding light-guiding plate. For example, in the embodiment, the length of the light-guiding plate is an integral multiple of the length of the corresponding light-emitting block or the light-emitting module. However, in other embodiments, as shown in FIG. 3, the length of the light-emitting block or the light-emitting module may be equivalent to the length of the corresponding light guide plate, and thus the invention is not limited thereto. In the embodiment shown in FIG. 3, the light-emitting block B _G spans the first light guide plate 11 and the second light guide plate 12, and includes the length of the light-emitting module M _G , the light-emitting block B _G or the light-emitting module M _G . Corresponding to the length of the first light guide plate 11 or the second light guide plate 12, the light-emitting block B _H spans the second light guide plate 12 and the third light guide plate 13 and includes the light-emitting module M _H , the light-emitting block B _H or The length of the light-emitting module M _H corresponds to the length of the second light guide plate 12 or the third light guide plate 13 . The light-emitting elements 20 in the same light-emitting module can be simultaneously turned on or off, that is, can be selectively illuminated simultaneously or simultaneously. For example, the light-emitting elements 20 in the light-emitting module M _A shown in FIG. 2 can be selectively illuminated simultaneously. Or turn off at the same time. Different light-emitting modules can be separately controlled. For example, the light-emitting module M _B and the light-emitting module M _C shown in FIG. 2 can be separately controlled, that is, the individual light-emitting modules can be driven to realize the light-emitting block. The local brightening function of the unit is, for example, partially extinguished in units of the light-emitting block B _B or the light-emitting block B _C shown in FIG. 2 .

In the prior art, the edges of the respective light-emitting blocks are distributed along the edges of the corresponding light guide plates, so that when the local light-extinguishing function is realized, the wear and tear caused by the transmission of light between different media is affected, so that one The actuated light-emitting block (such as the light-emitting block E shown in FIG. 1A) and the non-actuating light-emitting block adjacent to the air (for example, the light-emitting block B, H shown in FIG. 1A) will follow along. The edges between adjacent two light guide plates form a distinct light and dark boundary. In this embodiment, as shown in FIG. 2, the structure for forming the light-emitting block between the different light-guiding plates is such that the edges of the respective light-emitting blocks are staggered from the edges of the light guide plate, so that when the local light-extinguishing function is realized, The light-dark boundary between an actuated light-emitting block (e.g., light-emitting block B _B ) and an adjacent non-actuating light-emitting block (e.g., light-emitting blocks B _A , B _C , B _E ) is less pronounced and illuminates The light generated by the module (for example, the light-emitting module M _B ) exhibits a gradation effect at the edges of the respective light-emitting blocks (for example, the light-emitting block B _B ). In addition, other light-emitting elements 20 other than the light-emitting module (for example, the light-emitting elements 20 corresponding to the side edges 111, 132) can also be individually driven as needed.

In the present embodiment, the substrate 30 is a complete rectangular circuit board including a surface 31 and a line 32 as shown in FIGS. 4A and 4B. All of the light guide plates and the light-emitting elements 20 are disposed on the surface 31 of the same substrate 30. Upper, that is, all of the light guide plates are completely overlapped with the substrate 30, and the light-emitting elements 20 are connected by a line 32. In the preferred embodiment, substrate 30 is a printed circuit board and line 32 is an etched circuit formed on the printed circuit board.

4A is a schematic view showing an embodiment of a connection of light-emitting elements of the backlight module shown in FIG. 2 (or FIG. 3). As shown by line 32, the light emitting element along a second light guide plate 12 of the third side 122 is disposed in series with the light emitting element 20 are a first group of M _1, the fourth in the third light guide plate of FIG. 4A 13 The light-emitting elements 20 provided on the light side 131 are connected in series to the second light-emitting element group M ₂ , and the first light-emitting element group M ₁ and the second light-emitting element group M ₂ are connected in series to each other to constitute the light-emitting module M _F . In the embodiment of FIG. 2 or FIG. 3, different lighting modules (such as the lighting modules M _A , M _B , M _C , M _G ) are separately powered, so that the individual lighting modules (for example, the lighting modules M _A , M) _{The actions of B} , M _C , M _G ) can be controlled separately. Similarly, the light-emitting elements 20 disposed along the other side edges 111, 122, 131, and 132 of the first light guide plate 11, the second light guide plate 12, and the third light guide plate 13 may be connected in series in the same manner, and each of them constitutes a corresponding light. Modules, such as lighting modules M _D , M _E , M _F , M _H .

4B is a schematic view showing another embodiment of the connection of the light-emitting elements of the backlight module shown in FIG. 2 (or FIG. 3). As shown in FIG. 4B, the light-emitting elements 20 disposed along the third light-incident side 122 of the second light guide plate 12 and the fourth light-incident side 131 of the third light guide plate 13 are alternately connected in series to form a light-emitting module. M _F , that is, each of the light-emitting elements 20 disposed along the third light-incident side 122 is connected to the corresponding other light-emitting element 20 disposed along the fourth light-incident side 131 . In the embodiment of FIG. 2 or FIG. 3, different lighting modules (such as the lighting modules M _A , M _B , M _C , M _G ) are separately powered, so that the individual lighting modules (for example, the lighting modules M _A , M) _{The actions of B} , M _C , M _G ) can be controlled separately. Similarly, the light-emitting elements 20 disposed along the other side edges 111, 122, 131, and 132 of the first light guide plate 11, the second light guide plate 12, and the third light guide plate 13 may be alternately connected in series in the same manner, and each of them constitutes its corresponding Light-emitting modules, such as light-emitting modules M _D , M _E , M _F , M _H . In other embodiments, the light-emitting module in which the light-emitting elements 20 are connected in series with each other and the light-emitting elements 20 are alternately connected in series may be present in the same backlight module. In other embodiments, the light-emitting elements 20 can also be connected by other electrical connections, as long as the light-emitting elements 20 in the same light-emitting module can be simultaneously extinguished, and the light-emitting elements 20 in the other light-emitting modules can be separately separated. Independent control can be.

In the embodiment shown in FIG. 2 (or FIG. 3), the substrate 30 is a rectangular plate, and the design or shape of the single rectangular plate is simple, which is advantageous for cutting and positioning of the plate body. In other embodiments, however, other forms of substrates can be used. FIG. 5 is a schematic view of a second embodiment of a backlight module of the present invention. As shown in FIG. 5 , the backlight module includes a light guide plate set 10 , a light emitting element 20 , and a substrate 40 . The light guide plate group 10 includes a first light guide plate 11 , a second light guide plate 12 , and a third light guide plate 13 . The first light guide plate 11 includes a first light incident side 112; the second light guide plate 12 includes a second light incident side 121 and a third light incident side 122; and the third light guide plate 13 includes a fourth light incident side 131. The substrate 40 is elongated, and the substrate 40 between the first light guide plate 11 and the second light guide plate 12 is disposed along the first light incident side 112 and the second light incident side 121, and the second light guide plate 12 and the third guide The substrate 40 between the light plates 13 is disposed along the third light incident side 122 and the fourth light incident side 131, so that all of the light guide plates overlap only the corresponding substrate portions. The use of multiple strip designs saves board space, reduces circuit design complexity, increases yield and reduces cost. Further, the parallel sides of the first light guide plate 11 , the second light guide plate 12 , and the third light guide plate 13 other than the light incident sides are also provided with corresponding substrates 40 . The substrate 40 includes a surface 41 and a wiring (not shown), and the light-emitting elements 20 are disposed on the surface 41 and connected by wires. In the preferred embodiment, substrate 40 is a printed circuit board and the circuitry is an etched circuit formed on the printed circuit board. The relationship between the circuit on the substrate 40, the light-emitting element 20, and the light-emitting modules M _A to M _F can be referred to the related description in FIG. 4A or FIG. 4B, and will not be described in detail in this embodiment.

In the embodiment shown in FIG. 2 (or FIG. 3, FIG. 5), the plurality of light emitting elements 20 are disposed along the sides of the first light guide plate 11, the second light guide plate 12, and the third light guide plate 13, respectively, such that The light-emitting elements 20 disposed along the first light-incident side 112 of the first light guide plate 11 and the second light-incident side 121 of the second light guide plate 12 are disposed opposite to each other, and along the third light-incident side 122 of the second light guide plate 12 The light-emitting elements 20 disposed on the fourth light-incident side 131 of the three light guide plates 13 are also disposed opposite to each other such that the light-emitting elements 20 disposed on the adjacent light-incident sides are arranged in a double-row structure. In other embodiments, however, the light emitting elements 20 can be provided in other forms. 6 is a schematic view of a third embodiment of a backlight module of the present invention. As shown in FIG. 6, the light-emitting elements 20 disposed along the first light-incident side 112 of the first light guide plate 11 and the second light-incident side 121 of the second light guide plate 12 are staggered in a straight line in a single row structure, and along the second The light-emitting elements 20 disposed on the third light-incident side 122 of the light guide plate 12 and the fourth light-incident side 131 of the third light guide plate 13 are also alternately arranged in a single-row structure of another straight line. This arrangement can further shorten the spacing between different light guide plates to reduce the influence of the light guide plate spacing on the overall light uniformity of the backlight module. In addition, since the light-emitting elements 20 that emit light into the side edges 112, 121, 122, and 131 are changed to a single row, the number is smaller than that of the embodiments of FIGS. 2, 3, and 5, to the side edges 112, 121, 122, 131 The number of light-emitting elements 20 that emit light into the light is small. To maintain the overall light uniformity of the backlight module, the number of light-emitting elements 20 that emit light into the side edges 111, 132 in this embodiment will also be compared. 2. In the embodiment of Figures 3 and 5, the number of light-emitting elements 20 that emit light into the sides 111, 132 is small. To maintain comparable brightness, the embodiment of Figure 6 may utilize a higher brightness light emitting element 20. The reduction in the number of light-emitting elements 20 further reduces the time and cost required for the shots.

FIG. 7A is a schematic view showing an embodiment of a connection of light-emitting elements of the backlight module shown in FIG. 6. FIG. As illustrated the light emitting element, the light-emitting light guide 7A to the second side 12 of the third light incidence 12220 series to each other is a first light emitting element group M _1, the fourth 13 to the side of the third light guide plate 131 The light-emitting elements 20 that emit light are connected in series to the second light-emitting element group M ₂ , and the first light-emitting element group M ₁ and the second light-emitting element group M ₂ are connected in series to each other to constitute the light-emitting module M _F . In the embodiment of FIG. 6 , different lighting modules (eg, lighting modules M _A , M _B , M _C ) are separately powered, such that individual lighting modules (eg, lighting modules M _A , M _B , M _C ) Actuation can be controlled separately. In other embodiments, however, adjacent lighting modules (eg, lighting modules M _A , M _B , M _C ) may be cascaded to simplify the control circuitry. Similarly, the light-emitting elements 20 that emit light into the other side edges 111, 122, 131, and 132 of the first light guide plate 11, the second light guide plate 12, and the third light guide plate 13 may be connected in series in the same manner, and each constitutes its Corresponding to the light-emitting modules, such as the light-emitting modules M _D , M _E , M _F . In other embodiments, the light-emitting module M illustrated in FIG. 4A, FIG. 4B, and/or FIG. 7A may be present in the same backlight module.

FIG. 7B is a schematic view showing another embodiment of the connection of the light-emitting elements of the backlight module shown in FIG. 6. FIG. As shown in FIG. 7B, the light-emitting elements 20 that emit light into the third light-incident side 122 of the second light guide plate 12 and the fourth light-incident side 131 of the third light guide plate 13 are alternately connected in series to form a light-emitting module M _F . That is, each of the light-emitting elements 20 that emit light into the third light-incident side 122 is connected to the adjacent light-emitting element 20 that emits light into the fourth light-incident side 131. In this embodiment, different lighting modules (such as the lighting modules M _A , M _B , M _C ) are separately powered, so that the operation of the individual lighting modules (such as the lighting modules M _A , M _B , M _C ) can be Control separately. Similarly, the light-emitting elements 20 that emit light into the other side edges 111, 122, 131, and 132 of the first light guide plate 11, the second light guide plate 12, and the third light guide plate 13 may be connected in series in the same manner, and each constitutes its Corresponding to the light-emitting modules, such as the light-emitting modules M _D , M _E , M _F . In other embodiments, the light-emitting module M illustrated in FIG. 4A, FIG. 4B, FIG. 7A, and/or FIG. 7B may be present in the same backlight module.

FIG. 8A is a schematic view showing a fourth embodiment of a backlight module of the present invention. As shown in FIG. 8A, the backlight module includes a light guide plate group 10, a light emitting element 20, and a substrate 30. The light guide plate group 10 includes a first light guide plate 15 , a second light guide plate 16 , a third light guide plate 17 , and a fourth light guide plate 18 . The first light guide plate 15 includes a first light incident side 152, the second light guide plate 16 includes a second light incident side 161, the third light guide plate 17 includes a third light incident side 172, and the fourth light guide plate 18 includes a fourth light incident side. 181. The first light guide plate 15 and the second light guide plate 16 are arranged side by side in the first direction D ₁ , and the third light guide plate 17 and the fourth light guide plate 18 are also arranged side by side in the first direction D _{1 to} make the first light incident side 152 Facing the second light incident side 161, the third light incident side 172 faces the fourth light incident side 181. The first light guide plate 15 and the third light guide plate 17 are arranged side by side in the second direction D ₂ , and the second light guide plate 16 and the fourth light guide plate 18 are also arranged side by side in the second direction D ₂ , so that the first light incident side 152 and The third light incident side 172 is adjacent to the straight line, and the second light incident side 161 is adjacent to the fourth light incident side 181 and distributed on the straight line. At this time, the light emitting modules M _A are arranged in a rectangular shape.

However, in other embodiments, the light emitting module M _A shape is not limited to rectangular, but may be an irregular shape or a parallelogram shape. 8B, the first side 152 and the third light incident side of the light may not be a straight line 172, the second light incident side 161 and the fourth light incident side 181 also may be out of alignment when a light emitting module M _A Arranged in an irregular shape. Irregularly arranged by damage emitting module lighting module M _A M _A continuity of the boundary of light-emitting module of the fuzzy boundary of M _A, M _A light-emitting module so that the boundary is less likely to be identified and isolated.

As shown in FIG. 8A, the plurality of light-emitting elements 20 are disposed opposite to each other along the sides of the first light guide plate 15, the second light guide plate 16, the third light guide plate 17, and the fourth light guide plate 18, so as to be disposed on the first light-incident side. 152. The light-emitting elements 20 on the second light-incident side 161, the third light-incident side 172, and the fourth light-incident side 181 can respectively emit light toward the light-input side, and are disposed on the first light guide plate 15 and the second light guide plate 16 The light-emitting elements 20 of the other side edges 151, 162, 171 and 182 of the third light guide plate 17 and the fourth light guide plate 18 may be opposite to the opposite sides 151, 162, 171 and 182, respectively. Internal illumination. Provided along the first light incident side 152 and adjacent to the third light incident side 172, along the second light incident side 161 and close to the fourth light incident side 181, along the third light incident side 172 and close to the first entrance The light side 152 and the light-emitting elements 20 disposed along the fourth light-incident side 181 and adjacent to the second light-incident side 161, that is, the light-emitting elements 20 disposed at the intermediate portion of the substrate 30, together constitute the light-emitting module M _A . The other light-emitting elements 20 disposed along the first light-incident side 112 and the second light-incident side 121 respectively constitute the light-emitting module M _B , and the light-emitting elements 20 disposed along the third light-incident side 122 and the fourth light-incident side 131 are configured. Light module M _C . The light-emitting elements 20 in the same light-emitting module are synchronized and activated. For specific implementations, reference may be made to the related descriptions of FIG. 4A, FIG. 4B, FIG. 7A and FIG. 7B, and different light-emitting modules may be separately controlled, for example, a light-emitting module. M _A and the light-emitting modules M _B , M _C can be separately controlled to realize the function of local brightening. Compared to the foregoing embodiment, M _A light-emitting module of the present embodiment includes a light emitting element between the two light guide plates in the first direction D ₁ 20-15 arranged in parallel with the second light guide plate that is first a light-emitting element 20 between 16 and a light-emitting element 20 between the third light guide plate 17 and the fourth light guide plate 18; further, the first light guide plate 15 and the third light guide plate 17 are disposed along the second direction D2, and The two light guide plates 16 and the fourth light guide plate 18 are also disposed along the second direction D ₂ . Therefore, when a plurality of smaller-sized light guide plates are used for splicing, since the light-emitting module M _A crosses different light guide plates in the first direction D ₁ and the second direction D ₂ , the output light can be simultaneously considered in the first direction. Uniformity in D ₁ and second direction D ₂ and avoiding significant light and dark boundaries in both directions. In addition, other light-emitting elements 20 other than the light-emitting module M _A can be individually driven as needed.

FIG. 9 is a flow chart of an embodiment of a method for using a backlight module of the present invention. The backlight module includes a first light guide plate, a second light guide plate and a light emitting element. The first light guide plate and the second light guide plate respectively include a first light incident side and a second light incident side, and the first light guide plate and the second light guide plate are distributed in the first direction to make the first light incident side and the second light incident light Side facing. The plurality of light emitting elements are respectively disposed along sides of the first light guide plate and the second light guide plate such that the light emitting elements disposed along the first light incident side and the second light incident side respectively face the first light incident side and the second light incident light In the side inner light-emitting, the light-emitting elements 20 provided on the other side of the first light-guide plate and the second light-incident side of the first light guide plate and the second light guide plate can emit light toward the opposite sides. As shown in Figure 9, in the preferred embodiment, step 61 and step 62 are performed simultaneously. Step 61 includes simultaneously illuminating the light-emitting elements disposed between the first light guide plate and the second light guide plate toward the first light-incident side and the second light-incident side. Step 62 includes disabling a portion of the other illuminating elements. In other embodiments, however, all of the other illuminating elements may be left unactuated.

FIG. 10 is a flow chart of another embodiment of a method for using a backlight module of the present invention. The backlight module includes a first light guide plate, a second light guide plate, a third light guide plate, a fourth light guide plate, and a light emitting element. The first light guide plate, the second light guide plate, the third light guide plate, and the fourth light guide plate respectively include a first light incident side, a second light incident side, a third light incident side, and a fourth light incident side. The first light guide plate and the second light guide plate are respectively disposed in a first direction between the first light guide plate and the second light guide plate, so that the first light incident side and the second light incident side face each other, and the third input The light side faces the fourth light incident side; the first light guide plate and the third light guide plate and the second light guide plate and the fourth light guide plate are respectively disposed in the second direction, so that the first light enters The side is adjacent to the third light incident side and distributed on the straight line, and the second light incident side is adjacent to the fourth light incident side and distributed on the straight line. However, in other embodiments, the first light incident side and the third light incident side may not be in a straight line, and the second light incident side and the fourth light incident side may not be in a straight line. The plurality of light-emitting elements are disposed opposite to each other along the sides of the first light guide plate, the second light guide plate, the third light guide plate and the fourth light guide plate, so as to be disposed on the first light incident side, the second light incident side, and the third light incident The light-emitting elements on the side and the fourth light-incident side may respectively emit light toward the light-input side, and are disposed on the light-input sides of the first light guide plate, the second light guide plate, the third light guide plate and the fourth light guide plate. The other side illuminating elements can respectively illuminate their opposite sides. As shown in FIG. 10, in the preferred embodiment, step 71 and step 72 are performed simultaneously. Wherein step 71 includes placing a portion along the first side and adjacent to the third side, along the second side and adjacent to the fourth side, along the third side, and adjacent to the first side and along the fourth side The light-emitting elements disposed adjacent to the second side are simultaneously turned on and off, and respectively emit light toward the first side, the second side, the third side, and the fourth side. Step 72 includes disabling a portion of the other illuminating elements.

The present invention has been described by the above-described related embodiments, but the above embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, modifications and equivalents of the spirit and scope of the invention are included in the scope of the invention.

10. . . Light guide plate set

11. . . First light guide

111. . . Side

112. . . First light side

12. . . Second light guide

121. . . Second light side

122. . . Third light side

13. . . Third light guide

131. . . Fourth entrance side

132. . . Side

15. . . First light guide

152. . . First light side

16. . . Second light guide

161. . . Second light side

17. . . Third light guide

172. . . Third light side

18. . . Fourth light guide

181. . . Fourth entrance side

20. . . Light-emitting element

30. . . Substrate

31. . . surface

32. . . line

40. . . Substrate

41. . . surface

B _A . . . Light module

B _B . . . Light module

B _C . . . Light module

B _D . . . Light module

B _E . . . Light module

B _F . . . Light module

B _G . . . Light module

B _H . . . Light module

M _A . . . Light module

M _B . . . Light module

M _C . . . Light module

M _D . . . Light module

M _E . . . Light module

M _F . . . Light module

M _G . . . Light module

M _H . . . Light module

M ₁ . . . First light-emitting element group

M ₂ . . . Second illuminating element group

1A is a schematic view of a conventional backlight module;

FIG. 1B is a schematic diagram of the use of the conventional backlight module shown in FIG. 1A; FIG.

2 is a schematic view of a first embodiment of a backlight module of the present invention;

3 is a schematic view showing another embodiment of a light-emitting block of the backlight module shown in FIG. 2;

4A is a schematic view showing an embodiment of a connection of light-emitting elements of the backlight module shown in FIG. 2 (or FIG. 3);

4B is a schematic view showing another embodiment of the connection of the light-emitting elements of the backlight module shown in FIG. 2 (or FIG. 3);

5 is a schematic view of a second embodiment of a backlight module of the present invention;

6 is a schematic view of a third embodiment of a backlight module of the present invention;

7A is a schematic view showing an embodiment of a connection of light-emitting elements of the backlight module shown in FIG. 6;

7B is a schematic view showing another embodiment of the connection of the light emitting elements of the backlight module shown in FIG. 6;

8A is a schematic view showing a fourth embodiment of a backlight module of the present invention;

8B is a schematic view showing a fifth embodiment of a backlight module of the present invention;

9 is a flow chart of an embodiment of a method for using a backlight module of the present invention;

FIG. 10 is a flow chart of another embodiment of a method for using a backlight module of the present invention.

10. . . Light guide plate set

11. . . First light guide

111. . . Side

112. . . First light side

12. . . Second light guide

121. . . Second light side

122. . . Third light side

13. . . Third light guide

131. . . Fourth entrance side

132. . . Side

20. . . Light-emitting element

30. . . Substrate

31. . . surface

B _A . . . Light module

B _B . . . Light module

B _C . . . Light module

B _D . . . Light module

B _E . . . Light module

B _F . . . Light module

M _A . . . Light module

M _B . . . Light module

M _C . . . Light module

M _D . . . Light module

M _E . . . Light module

M _F . . . Light module

Claims (21)

A backlight module includes: a first light guide plate including a first light incident side; and a second light guide plate including a second light incident side, the first light guide plate and the second light guide plate being first The direction distribution is such that the first light incident side of the first light guide plate faces the second light incident side of the second light guide plate; and the plurality of light emitting elements are respectively along the first light incident side The second light incident side is disposed, and respectively emits light toward the light incident side, wherein the light is disposed along the first light incident side of the first light guide plate and the second light incident side of the second light guide plate At least part of the components form a light-emitting module and are simultaneously activated and extinguished. The backlight module of claim 1, further comprising a substrate, the substrate comprising a surface and at least one line, the light guide plate and the light emitting elements are disposed on the surface, and the light emitting elements are Connected by this line. The backlight module of claim 1, further comprising a substrate disposed along the first light incident side of the first light guide plate and the second light incident side of the second light guide plate Between the first light guide plate and the second light guide plate, the substrate comprises a surface and at least one line, and the light emitting elements are disposed on the surface and connected by the line. The backlight module of claim 1, wherein the light-emitting elements disposed along the first light-incident side of the first light-guiding plate are connected in series to each other as a first light-emitting element group along the second light-guiding plate. The light-emitting elements disposed on the second light-incident side are connected in series to form a second light-emitting element group, and the first light-emitting element group and the second light-emitting element group are connected in series to form the light-emitting module. The backlight module of claim 1, wherein the light-emitting elements disposed along the first light-incident side of the first light guide plate and the second light-incident side of the second light guide plate are staggered in series The light emitting module is constructed. The backlight module of claim 1, wherein the light-emitting elements disposed along the first light-incident side of the first light guide plate and the second light-incident side of the second light guide plate are staggered A straight line of single row structure. The backlight module of claim 6, wherein the light-emitting elements disposed along the first light-incident side are connected in series to each other as a first light-emitting element group, and the light-emitting elements are disposed along the second light-incident side. The elements are connected in series to each other as a second light-emitting element group, and the first light-emitting element group and the second light-emitting element group are connected in series to form the light-emitting module. The backlight module of claim 6, wherein the light-emitting elements disposed along the first light-incident side and the second light-incident side are alternately connected in series to form the light-emitting module. The backlight module of claim 1, further comprising: a third light guide plate, comprising a third light incident side adjacent to the first light incident side of the first light guide plate; The fourth light guide plate includes a fourth light incident side adjacent to the second light incident side of the second light guide plate, wherein the third light guide plate and the fourth light guide plate are disposed according to the first direction Between the first light guide plate and the third light guide plate and between the second light guide plate and the fourth light guide plate, respectively, arranged in a second direction; and a plurality of light emitting elements along the third light input The side and the fourth light-incident side are distributed, and emit light toward the light-incident side, wherein the light-emitting module further comprises a portion disposed along the first light-incident side and adjacent to the third light-incident side, along the second The light-emitting side is disposed adjacent to the fourth light-incident side, and is disposed along the third light-incident side and adjacent to the first light-incident side and along the fourth light-incident side and adjacent to the second light-incident side element. A backlight module includes: a substrate having a surface; a first light guide plate disposed on the substrate and having a first light incident side; a second light guide plate disposed on the substrate and having Having a second light-incident side for the first light-incident side; and a light-emitting module comprising a plurality of first light-emitting elements, a plurality of second light-emitting elements and the first light-emitting elements are simultaneously activated and extinguished, and disposed on the substrate The first light-emitting elements are disposed along the first light-incident side, and light can be emitted toward the first light-incident side, and the second light-emitting elements are disposed along the second light-incident side. Light can be emitted to the second light incident side. The backlight module of claim 10, wherein the first light-emitting elements are connected to each other in series as a first light-emitting element group, and the second light-emitting elements are connected to each other in series to form a second light-emitting element group, and The first light emitting element group and the second light emitting element group are further connected in series to form the light emitting module. The backlight module of claim 10, wherein the first light-emitting elements and the second light-emitting elements are alternately connected in series to form a light-emitting module. The backlight module of claim 10, wherein the first light-emitting elements and the second light-emitting elements are staggered in a straight line in a single row. The backlight module of claim 13, wherein the first light-emitting elements are connected to each other in series as a first light-emitting element group, and the second light-emitting elements are connected to each other in series to form a second light-emitting element group, and The first light emitting element group and the second light emitting element group are further connected in series to form the light emitting module. The backlight module of claim 13, wherein the first illuminating The element and the second light-emitting elements are alternately connected in series to form a light-emitting module. The backlight module of claim 10, wherein the length of the first light guide plate or the second light guide plate is equivalent to an integral multiple of the length of the light emitting module. The backlight module of claim 10, wherein the length of the first light guide plate or the second light guide plate is equivalent to the length of the light emitting module. The backlight module of claim 10, wherein the first light guide plate and the second light guide plate both completely overlap the substrate. The backlight module of claim 10, wherein the first light guide plate and the second light guide plate partially overlap the substrate. A backlight module includes: a substrate having a surface; a first light guide plate disposed on the substrate and having a first light incident side; a second light guide plate disposed on the substrate and having Having a second light-incident side for the first light-incident side; a third light-guiding plate disposed on the substrate and having a third light-incident side; and a fourth light guide plate disposed on the substrate And having a fourth light incident side for the third light incident side; and a light emitting module, comprising a plurality of first light emitting elements, and the plurality of second light emitting elements and the first light emitting elements are synchronized and extinguished, and configured The first light-emitting elements are disposed along the first light-incident side and the third light-incident side on the surface of the substrate, and light can be emitted to the first light-incident side and the third light-incident side. The second light-emitting elements are disposed along the second light-incident side and the fourth light-incident side, and light can be emitted to the second light-incident side and the fourth light-incident side. The backlight module of claim 20, wherein the first light-emitting elements and the second light-emitting elements are both light-emitting diodes.